Method of marking glass



May 18,1926. 1,585,555

- A. A. MANsURzADAH METHOD OF MARKING emss Filed July 23, 1925 INVENTOR- a 67. (WZH MyMI' Hda/fi l ATTORNEYS Patented May 1&3, M926.

ABDUL .AZIZ ll'IANSURZADAH, OE OAKLAND, CALEFORNIA.

METHOD 0F IEARKIHG- GLASfe.

Application filed July 2-3 Ellis invention relates to a new and i proved method of marking glass and like, particularly for the providing of trade mark or other distinguishing mar thereon. My invention relates partic iarl to a process of so treating the surface of glass, precious stones, etc, as to modify the iydroscopic properties thereof in a manner rendering such treated surfaces visible when moisture is condensed thereon, as by breathing on the surface treated. I am aware that this method of marking glass is not broadly new, and I am therefore not claiming such invention broadly herein. It is the primary object of my invention to provide an improved method of marking glass and like surfaces in a manner rendering such marl: more permanent than has been done hereto fore and Without in any manner injuring or impairing such surfaces.

The surfaces of glass and the like have been heretofore marked by various means rendering the mark visible upon the condensation of moisture thereon. Such marks, however, have been only of a temporary character, ordinarily being a dries on the surface and comes off readily when the surface is polished or subjected to Washing. My invention pertains to the marking" of these surfaces Wherein a chemical agent applied to the surface reacts with certain of the constituents of the glass and forms a chemical change in the hydroscopic properties of the treated surface Without in any manner impairing or injuring such surface.

I have hereinafter disclosed my preferred method of carrying out my invention, but it will be understood that such description is not to be construed as strictly defining or limiting the scope of the invention, the claims appended to this specification being relied upon for that purpose.

Referring to the figures in the accomnanyinn; drawing,

Fig. 1 shows a lens as it normally appears when marked by any improved method.

2 shows the same lens as it appears when n'ioisture is condensed on the treated surface thereof, as by breathing thereon.

In carrying out my improved process, I first provide a solution of the treating agent in one of the following manners. The agent which I use most preferably and Which forms the most permanent marl: is chronium or any of its compounds, such as chromic liquid which 1325. Serial No. 45,701-

ccn'ipounds, chromous compounds, acid, and dichroinic acid. sodimnv dichroniate (ra oro.)

um dichroinate (P12637297) forms the most preferable treating I apply this treating agent to the surface of the lass by means of a pen, brush, other convenient means. face thereafter allowed to dry and reduce or oxidize in ordinary temperature, exposed to the sun, strong artificial light, or heated to about 200 B. After this treatment, it will be found that the mark will normally be entirely invisible on the glass but by subjecting the surface to slight moisture, as by breathing thereon, the marl: will become plainly visible and remain so until the moisture disappears, the marlr entirely disappearing with the moisture.

As has been above stated, the mark applied by my improved process remains 6n the treated surface for a considerable period of time, the same being substantially permanent. The reason for this is that the treat-- ing agent forms a chemical react-ion with certain of the constituents of the glass, such as silica, therein, and forms a permanent change in the hydroscopic properties thereof, whereby the moisture collects on the treated surface in a form more or less concentrated than on the untreated surface. The treatment, therefore, involves chemical change in the su 'ace of the glass instead of merel drying of the chemical substance on the surface has been done heretofore.

hromium and other compounds do not readily take to the surface of glass surfaces and for t. reason I n follows: I mix: the i l compound "Jith r soap (soluble or i tron made of these ingr the glass more easily and hi to furthermore aid in the drying, oxidizing thereof.

l Jhile as above stated, chromium and its compounds preferably used as the ing agent in my improved process, nevertiieless, I have found that a mark which will re main for quite some 9 can be made by using the following solution This solution com prises a preparation of soaps (soluble or insoluble) with alcohol or sugar. This treatment acts on the es in a manner similar to that above described and results in a marl: which will remain for a considerable period oi: time. This solution is applied in the manner above described, and in both cases the solution is thoroughly lried and IBL'iFCQtl or oxiclizecl in completing the process.

Having thus (lescrihetl my invention, what I claim and desire to secure h Letters fatent isl. A method of marking gloss and the like consisting of chemically modifying the hythroscopio properties oi a portion of the surface thereof by applying thereto chemical agent containing ehomiuin in solution which reacts chemically with certain of the glass constituents to modify the hydroscopic properties of the treated surface and therentter exposing); the egientto heat or light to complete the hemical reaction and the marking operation.

2. A niethotl of marking glass and the lil-ze consistingof chemically modifying the hyclroscopio properties of a portion of the surtnce thereof by applying thereto a chemical agent containing: chromium and thereafter treating the su-inein 2L manner causing the agent to react chemically with certain of the constituents to inoslity the hydroscopic proper s ot'. the treated surface.

1%. A method of uiarl zing glass and the like consisting of chon ically modifying; the l1;- (ll'OSCOPlC properti s oi a portion of the surface thereof by applying-r thereto 2. chemical agent in containing; chromium in solution with means rendering; the chromium more applicable to such surface, and thereafter treating the some in a manner causing; the agent to react chemically with certain of the glass constituents to modify the-hydroscopic properties of the treated surface.

ABDUL ft JIZ MANSURZADAH. 

